Hi,
First of all, neither Century or WASR is a "brand". WASR is the rifle designation and it is imported and modified by Century, so in essence if you get a WASR, you are buying a Century gun.
All I can say is, the WASR or other "brand" AK debate is highly discussed. You can find pages of info by doing a search in the rifle discussion forum.
It boils down to that a WASR is not as pretty as other manufacturer's AKs, but it will function. Romanian made AKM variants, even the earlier imports, are not known for their quality in terms of fit and finish anyway. They can come from Romania with canted sights and gas blocks, and the finish is grungy in apperance. Added to this is that Century is not known for precise work or care when they make modifications to the rifles to accept hi cap mags, etc.
It is best to handle and see all the Romanian made rifles in person if you go this route. The WASR series is the absolute economy AKM type rifle available out there for most people who just want something similar to the AKM platform.
Here is a good site that lists the commercially available Romy guns.
http://www.gunsnet.net/Linx310/
Btw, if you buy Lancaster, which is the manufacturer, you are still buying a Romanian rifle, except that their Romy rifles are built using "G" kits and US made receivers and are much closer to an actual military spec rifle than a WASR will ever be.
The same goes for earlier Century imported Romanian rifles such as the SAR 1, SAR 2, etc.